Solar Panel Calculator & Tilt

PV Master is a solar panel calculator that starts from a real roof. Search an address or use your location, and it combines satellite data on the building, decades of NASA climate records and the local weather to work out what panels there would produce and what they would save.

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Size the system
The solar system sizing calculator turns your daily energy use into a panel count, an inverter size and a battery bank. A string sizing check then confirms the panels stay inside the inverter's voltage and current limits, including the cold-morning voltage that catches people out.

Find the right panel angle
PV Master gives the optimal tilt and azimuth for your location, and the compass and tilt tool reads your phone's heading and pitch so you can lay it on a panel or a rafter and see how far off you are. It works as a solar panel angle finder for a roof mount, a ground rack or a portable panel.

Plan for off grid or backup
The battery capacity and energy storage calculators size a bank for the days of autonomy you want, which makes PV Master an off grid solar system calculator for a cabin, a van or a backup setup at home.

Read the roof
This is where PV Master goes further than a plain solar panel calculator. Where satellite coverage exists, the rooftop report lists each roof segment with its pitch, facing and area, how many panels fit, and the yearly production the optimal layout would reach.

Check the money
Solar ROI, panel cost, incentives, net metering and a side by side financial comparison show whether a system pays for itself and how soon. The financial analysis uses US rates and incentives.

Fourteen calculators in one solar PV calculator
System sizing, panel size, panel cost, inverter size, string sizing, battery capacity, energy storage, roof fit, energy potential, solar ROI, financial comparison, incentives, net metering and carbon offset.

Also included
• A satellite solar map with solar metrics and month by month climate for any location
• Local weather, so you can see how conditions affect production
• A PDF report of a location to share with an installer
• A guide and a searchable glossary of photovoltaic terms, from irradiance to string voltage

PV Master Pro
Rooftop lookups, the full solar metrics and the monthly sun data come with PV Master Pro, as a subscription or a one-time unlock. A single rooftop lookup can also be bought on its own. Payment is charged to your Google Play account, and a subscription renews until you cancel it in Google Play under Payments and subscriptions.

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Recent changes:
Fixed a crash that could happen when a purchase was interrupted by a dropped connection to Google Play.
Location now works on devices without Google Play services.
Devices with an older Play Store app no longer show a confusing error message.